In Your Research Lab You Observe a Number of Brain

In your research lab you observe a number of brain sections under the microscope from various phases of development in a mouse embryo. You notice that in the later sections, fewer neurons are present. What might you conclude?

A) The mouse has a disorder that affects neuronal development and would not have lived to adulthood.
B) As the cells died, they likely caused damage to adjacent cells due to release of intracellular contents.
C) The mouse is developing normally and the neuronal loss is expected.
D) The neurons likely died because they were inappropriately attacked due to the immature immune system.